The answer to this quesiton is <span>naturalistic observation
</span><span>naturalistic observation refers to a type of research in which scientists will observe the subject at their natural environment.
In this particular case, 'daters' are the subject of their experiment and 'dating events' are the natural environment.</span>
The correct answer is the classical conditioning. Classical
conditioning is defined as a king of learning procedure by which a kind of
biological potent stimulus is being associated or paired with a stimulus that
is considered to be previously neutral.
Our best estimate for the age of the universe is based on what we currently know about the universe's history is 13.772 billion years.
<h3>How to calculate the age of the universe?</h3>
There are two methods by which the scientists calculate the age of the universe:
By searching for the oldest stars
By calculating the rate of expansion of the universe and generalizing back to the Big Bang Theory.
Thus, Our best estimate for the age of the universe is 13.772 billion years.
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